What was that loud pop ?!

I just came inside after shooting a couple hundred balls in the backyard, testing my rig. I took the barrel and hopper off my gun (BT4 ERC) to clean. Sat my waist pack down, which holds my 68/4500, remote line still attached, knob screwed out and no pressure in the line. I turned around and started cleaning my barrel.

*LOUD POP* ... loud enough to make my ears hurt just a little. Much louder than a marker shooting.

My first thought was "great, my tank just blew up". I check it and there's no signs of cracks or anything on the outside. Pressure guage still about 1000 psi, right where it was when i set it down. I removed the remote line, no visual problems.

I checked my other HPA tank that I hadn't used. Gauge psi right where I left it. I have a milk crate full of older CO2 tanks nearby, nothing looks any different.

Ok... I gassed it up, worked fine... disassembled it. I didn't find any busted O-rings. I found some yellow goop around the barrel adapter that I guess could be alien evidence, but it was probably just paint.

I'm not as experienced as you guys but I don't see how it could be holding any pressure anywhere if the gas system was open.

When you run a gun out of air, but do not disconnect the tank or in your case the remote, you don't necessarily run it to zero pressure, just low enough that the gun won't recock. The pop could have been the valve opening slightly from the hammer spring holding the hammer against the valve pin. It could also have been from some air trapped between the hammer and valve that slowly pushed the hammer back enough to find a way out. Josteling the gun, even putting it down, could have been enough of an impact that it caused the hammer or valve to slowly move a little and release the pressure with a pop.

You air up the marker, put on the gloves, strap on the mask, and walk onto the field.. it doesn't matter that you failed a test, that your girlfriend broke up with you last night, or that you got a ticket on the way there... your world is right for the next couple hours, this is your heaven on earth.. live it.. love it.. Paintball